Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym COSS is...

COSS is

Commander's OPSEC Support System

More Meanings For COSS:

Cross Operating System Service
Common Object Services Specification
Cyclic Object Storage System
Certified Occupational Safety Specialist
Council On Student Services
College Of Social Sciences
Commander's OPSEC Support System
Centaur Operations at the Space Station

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